sometime last year in may i noticed smtp authentication stopped working. I.e if your trying to auth to use their smtp server on port 25, no ssl when using a non-telstraclear connection it won't work anymore.

I'm trying to find out if this was stopped, and the main reason why.

The only reason i can think of is because of spam , or customers having their mail credentials phished and then bots using the credentials to use smtp authentication and then send out spam via tcl smtp servers.